Method and apparatus for formation of thermoplastic film

Details Method and apparatus for formation of thermoplastic film Method and apparatus for formation of thermoplastic film

B - Operations, Transporting

29

C

18/528

B29C 49/64 (2006.01) B29C 47/00 (2006.01) B29C 47/88 (2006.01)

Patent

CA 2012837

ABSTRACT OF THE DISCLOSURE An apparatus and method for high-production rate processing of extruded tubular thermoplastic thick-thin film having at least one, preferably two, thickened wall profiles in the longitudinal direction of the film as it is formed. The method steps includes extruding a molten thermoplastic extrudate from an annular die, cooling the extrudate so as to form a film bubble having a thickened wall portion, and further cooling the thickened wall portion to avoid difficulties after the bubble is collapsed and fed through nip rolls for collection or subsequent processing. The product film is especially useful for shopping bags with handles.

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